Repression of Gonadotropin-Releasing Hormone (GnRH) Gene Expression by Melatonin May Involve Transcription Factors COUP-TFI and C/EBP Beta Binding at the GnRH Enhancer
Bibliographic record
Abstract
Melatonin activates membrane-bound G-protein-coupled receptors mt1 and MT2, but may also bind a family of orphan nuclear receptors, including RORalpha and RZRbeta, representing another potential molecular mechanism of melatonin action. Recently, we demonstrated that melatonin downregulates gonadotropin-releasing hormone (GnRH) gene expression in the GT1-7 cell line, specifically at the level of the neuron-specific GnRH gene enhancer. In this study, we have examined the region located at -1736/-1728 of the GnRH enhancer shown to be involved in the repression of GnRH by melatonin. This region includes hexameric consensus binding sites for orphan nuclear receptors, including ROR/RZR and COUP-TFI, as well as other defined consensus binding sites for AP-1 and C/EBP. Using electrophoretic mobility shift analysis (EMSA), we have demonstrated that GT1-7 nuclear proteins bind specifically to this region of the GnRH enhancer to form 4 complexes. EMSA antibody supershift analysis indicates that the transcription factors COUP-TFI and C/EBP beta bind two specific complexes, but RORalpha, Oct-1, Pbx-1, c-fos, or c-jun antibodies failed to produce any detectable supershifts. These results provide the first evidence that melatonin may mediate its direct neuroendocrine control of GnRH gene expression through transcription factor binding at specific regions of the GnRH enhancer.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".